/* ============================================
   新纪元英语词汇系统 - 组件样式
   ============================================ */

/* 3D Card Flip Components */
.perspective {
    perspective: 1000px;
}

.preserve-3d {
    transform-style: preserve-3d;
}

.backface-hidden {
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.rotate-y-180 {
    transform: rotateY(180deg);
}

.card-transition {
    transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
}

/* Learning Control Buttons */
.learning-btn {
    transition: all 0.2s ease;
}

.learning-btn:active {
    transform: translateY(2px);
    border-bottom-width: 2px;
}

/* Task Cards */
.task-card {
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.task-card:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.task-card.learn {
    border-left-color: #4f46e5;
}

.task-card.test {
    border-left-color: #f43f5e;
}

/* Student Badge */
.student-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Word List Item */
.wordlist-item {
    transition: all 0.2s ease;
    border: 1px solid #e2e8f0;
}

.wordlist-item:hover {
    border-color: #4f46e5;
    background-color: #eef2ff;
}

/* Test Option Buttons */
.test-option {
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.test-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.test-option:hover::before {
    left: 100%;
}

.test-option.correct {
    background-color: #d1fae5;
    border-color: #10b981;
    color: #065f46;
}

.test-option.wrong {
    background-color: #ffe4e6;
    border-color: #f43f5e;
    color: #9f1239;
}

/* Modal Styles */
.modal-overlay {
    backdrop-filter: blur(4px);
}

.modal-content {
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Progress Bar */
.progress-bar {
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* Tag/Badge Styles */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.tag-blue {
    background-color: #dbeafe;
    color: #1e40af;
}

.tag-purple {
    background-color: #f3e8ff;
    color: #7c3aed;
}

.tag-green {
    background-color: #d1fae5;
    color: #065f46;
}

.tag-red {
    background-color: #ffe4e6;
    color: #9f1239;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #64748b;
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f4f6;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 0.75rem;
    background-color: #1e293b;
    color: white;
    font-size: 0.75rem;
    border-radius: 0.375rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 50;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    bottom: calc(100% + 5px);
}

/* Status Indicators */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.5rem;
}

.status-dot.active {
    background-color: #10b981;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
}

.status-dot.inactive {
    background-color: #94a3b8;
}

.status-dot.warning {
    background-color: #f59e0b;
    box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.3);
}